package com.t14;

import java.util.Arrays;
import java.util.List;

/**
 * Created by xuyiwei on 2018/8/7.
 */
abstract class Shape{
    void draw(){System.out.println(this+".draw()"); }
    abstract public String toString();
}
class Circle extends Shape{
    @Override
    public String toString() {return "Circle";}
}
class Square extends Shape{
    @Override
    public String toString() {return "Square";}
}
class Triangle extends Shape{
    @Override
    public String toString() {return "Triangle";}
}
public class Shapes {
    public static void main(String[] args) {
        List<Shape> shapeList = Arrays.asList(new Circle(),new Square(),new Triangle());
        for(Shape shape : shapeList){
           shape.draw();
        }
    }
}
